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2012年49 No.4
Resistance of transgenic cotton to cotton bollworm and cutworms
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Key Words：normally． transgenic cotton bollworm-and glyphosate-resisitant cotton，Helicoverpa armigera，Agrotis segetum，Amathes c-nigrum，development
Abstract： The purpose of this study was to assay the resistance of transgenic cotton expressing Bt Cry1A and CP4 EPSPS genes to the cotton bollworm Helicoverpa armigera (Hübner) and the cutworms Amathes c-nigrum and Agrotis segetum． Results show that transgenic cotton had moderate resistance to early instar second generation cotton bollworm larvae insouthern Xinjiang with a corrected mortality of 70． 4%． Bt Cry1A toxin protein was present in leaves throughout the entire developmental period of cotton plants but the amounts of this toxin peaked during the cotyledon period and decreasedgradually over time． Transgenic cotton was very toxic toA． c-nigrum larvae; feeding on transgenic cotton leaves led todeath of most larvae and the growth of surviving larvae was retarded． However，transgenic cotton had no adverse effect on A． segetumlarvae which developed .